Concentrations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014 Customer	Jan. 31, 2013 Customer
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Minimum rate of consolidated accounts receivable	10.00%	10.00%
Foreign bank deposits	$ 14,074
Number of suppliers manufacture land based seismic systems and equipment in use	2
Credit Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Concentration risk number Of customer	1	3
One Major Customer [Member] | Credit Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Aggregate amount of accounts receivable from customers	3,102
Three Major Customer [Member] | Credit Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Aggregate amount of accounts receivable from customers		$ 9,591